电动自行车已是我们生活中必不可少的交通工具（如...
（1）与摩托车相比较，电动车使用电能比较节能，并且噪声小，也没有没有尾气排放，非常环保．
（2）车座制成马鞍状：增大受力面积，减小压强，人座上比较舒服．
轮胎上有凹凸不平的花纹：增大接触面粗糙程度，增大摩擦．如下表所示：
（3）压强的单位是帕斯卡，符号是Pa，而表中压强的单位是P，压强单位错误．
故答案为：（1）噪声小、没有尾气排放．（2）如上表所示．（3）压强单位错误，P应该是Pa．
（2）车座制成马鞍状：增大受力面积，减小压强，人座上比较舒服．
轮胎上有凹凸不平的花纹：增大接触面粗糙程度，增大摩擦．如下表所示：
| 结构或构件名称 | 结构或构件中采取的有效措施 | 应用的物理知识或所能达到的目标 |
| 尾灯 | 反射面呈角反射器 | 能使入射光线平行反向射回增强反射效果，消除安全隐患 |
| 车座 | 设计制成马鞍状 | 增大受力面积，减小压强，乘坐舒适 |
| 轮胎 | 凹凸不平的花纹 | 增加接触面粗糙程度，增大摩擦 |
故答案为：（1）噪声小、没有尾气排放．（2）如上表所示．（3）压强单位错误，P应该是Pa．
急！急！急！~根据中文意思和英文提示写一篇意思连...
Bikes are very popular in Beijing, it is easy for go to school or go to work by bike. Now more and more people have bought cars, but it will make the air dirty, that is really not friendly to the environment.
However, bikes can help protect the environment, it is healthy, and, what's more, we can save energy by riding a bike instead of driving. So, I prefer a bike than a car, because bike is eco-friendly, cheap, and quite convinient when you'll park it. This is not what a car can easily do.
However, bikes can help protect the environment, it is healthy, and, what's more, we can save energy by riding a bike instead of driving. So, I prefer a bike than a car, because bike is eco-friendly, cheap, and quite convinient when you'll park it. This is not what a car can easily do.
C++程序设计问题
作业问题···额
作业自己做吧！这些题只有之前做过而且有备份的才有可能发上来，做这个要耗时不少···
作业自己做吧！这些题只有之前做过而且有备份的才有可能发上来，做这个要耗时不少···
爸爸星期日到奶奶家使用的交通工具每小时行80千米...
答案应该是C、汽车。因为，在自行车、摩托车、汽车这三种交通工具中，每小时行80千米的应该题汽车，自行车每小时14千米左右，摩托车正常情况下是不能跑每小时80千米的，所以，答案应该是汽车。
英语作文： 自行车在北京很受欢迎，骑车上学或上班...
Nowadays more and more people have their ownbike，It is very popularin Beijing。the bike is easy to use,we can go to school or work by bike.And many people buy cars now,but it awayls make air dirty.The bike can also help us keep healthy and save energy.
In my opinion,I also like to go out by bike . Because the bike is very convenient,I can park in the place where the car can not park.Next,Beijingis easy totraffic jams,the bike is very flexible.Finaly ,Use bike can save money....
In a word,Iprefer the bike when we go out. 这就差不多了嘛 初一~~
In my opinion,I also like to go out by bike . Because the bike is very convenient,I can park in the place where the car can not park.Next,Beijingis easy totraffic jams,the bike is very flexible.Finaly ,Use bike can save money....
In a word,Iprefer the bike when we go out. 这就差不多了嘛 初一~~
